package com.hmall.gateway.filters;

import cn.hutool.core.text.AntPathMatcher;
import com.hmall.gateway.config.AuthProperties;
import com.hmall.gateway.util.JwtTool;
import lombok.RequiredArgsConstructor;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.List;

/**
 * @author fjh
 */
@Component
@RequiredArgsConstructor
public class AutoGlobalFilter implements GlobalFilter, Ordered {
    private final AuthProperties authProperties;
    private final JwtTool jwtTool;
    private final AntPathMatcher antPathMatcher=new AntPathMatcher();
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        // 1.获取request
        ServerHttpRequest request=exchange.getRequest();
        // 2.判断是否需要进行登录拦截
        if(isExclude(request.getPath().toString())){
            return chain.filter(exchange);
        }
        // 3.获取token
        String token=null;
        List<String>headers= request.getHeaders().get("authorization");
        if(headers!=null&&!headers.isEmpty()){
            token=headers.get(0);
        }
        Long userId=null;
        // 4.校验并解析token
        try{
            userId=jwtTool.parseToken(token);
        }catch (Exception e){
            ServerHttpResponse response= exchange.getResponse();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        // 5.传递用户信息
        String userInfo=userId.toString();
        System.out.println("这是一个网关"+userInfo);
        ServerWebExchange ex=exchange.mutate()
                .request(b->b.header("user-info",userInfo))
                .build();
        return chain.filter(ex);
    }

    private boolean isExclude(String path) {
        for(String pathPattern:authProperties.getExcludePaths()){
            if(antPathMatcher.match(pathPattern,path)){
                return true;
            }
        }
        return false;
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
